Can you help me find a part of a Saarinen tulip chair. I am refurbishing some Saarinen tulip chairs. On the underneath part of each chair the seat is screwed into the pedestal using a nut and bolt. I am missing the nut on one of them and I am having a difficult time finding a replacement. It appears the nut is round and thin and approx. 1/2" or maybe 9/16" in diameter.